Saw it as well and looked it up in red book unpopular when there was 40/2 not much bigger for Leica CL so it is a lesser lens than summicron 40 marginally smaller - but now because it was not popular - total production was only 400 copies so it is quite rare , rarer for instance than the new 66mm for instance. A lens for collectors (says faint haze- but rare lens) or someone really curious but if you want a 40 to shoot there are lots of decent 40/2 CL lenses out there, a really good copy is more than 500, but maybe 1K will do it I have seen several offered for sale in recent months, if you want a 40/2 you can get the Minolta version (same optics) slightly different from filter and later ones of Minolta have better coating, they are cheaper than lenses stamped Leica.